/Engine/Plugins/Experimental/GeometryScripting/Source/GeometryScriptingCore/Public/GeometryScript/MeshPolygroupFunctions.h
Gets the PolyGroup ID associated with the specified Triangle ID and stored in the Group Layer. If the Group Layer or the Triangle does not exist, the value 0 will be returned and bIsValidTriangle set to false.
static int32 GetTrianglePolygroupID ( [UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) * TargetMesh, [FGeometryScriptGroupLayer](API\Plugins\GeometryScriptingCore\GeometryScript\FGeometryScriptGroupLayer) GroupLayer, int TriangleID, bool & bIsValidTriangle )